How to Log Uncaught Exceptions in Python?

Logging Uncaught Exceptions in Python

When an exception occurs in a Python program and is not handled within the current execution block, it is automatically printed to standard error (stderr). This behavior can be inconvenient, especially when you want to capture all exceptions for logging or debugging purposes.

To solve this issue, you can configure the logging module to automatically output uncaught exceptions. Here's a solution that leverages the logging.exception() function:

<code class="python">try:
    raise Exception('Throwing a boring exception')
except Exception as e:
    logging.exception(e)</code>

This approach is effective, but requires explicitly handling and logging each exception. For a more automated solution, you can override Python's sys.excepthook function, which is responsible for handling uncaught exceptions.

Below is an example of a complete logging configuration that includes additional features such as:

• Ignoring keyboard interrupt (Ctrl C) events to allow graceful program exit
• Utilizing the logging module's formatting capabilities for exception reporting
• Outputting unhandled exceptions to stdout instead of stderr

<code class="python">import sys
import logging

logger = logging.getLogger(__name__)
handler = logging.StreamHandler(stream=sys.stdout)
logger.addHandler(handler)

def handle_exception(exc_type, exc_value, exc_traceback):
    if issubclass(exc_type, KeyboardInterrupt):
        sys.__excepthook__(exc_type, exc_value, exc_traceback)
        return

    logger.error("Uncaught exception", exc_info=(exc_type, exc_value, exc_traceback))

sys.excepthook = handle_exception

if __name__ == "__main__":
    raise RuntimeError("Test unhandled")</code>

With this configuration in place, all uncaught exceptions will be logged automatically by the logging module.

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